/**
  * Author: Mei
  * Date: 2020-12-30 19:13
  * Description:
  */
#include "head.h"

int main() {
    vector<int> v{1, 2, 3, 4, 5, 7, 8, 9};
    v.erase(v.begin()+3);
    for (auto it : v) {
        cout << it << " ";
    }
    to_string(2.3);

    return 0;
}